In terms of pet peeves, loose for lose comes between it's for its (surely the most annoying of all) and lead for led (which I'm now seeing even on supposedly edited sites like HuffPo and Salon).
I think it must be to do with other uses of the word.
A dog lead
I lead him away.
A good read.
I read it at work.
Hmmm. Maybe "lead" has more "ee" uses, so the brain sees "lead" and hears "leed"? But then, what about "lead" weights? It was made of lead.
A conundrum wrapped in an enigma...until someone solves it. Don't fight forces, use them R. Buckminster Fuller.
It's a little hard on the eyes but it beats spending the extra time proofing.